Mollaret's meningitis and herpes simplex virus type 2 infections.

Benign recurrent aseptic meningitis is a rare disorder described by Mollaret in 1944. When initially described, this form of aseptic meningitis had no identifiable infecting agent. New sophisticated diagnostic tools have now identified herpes simplex type 2 virus as the most commonly isolated agent. Antiviral treatment has been used successfully for prophylaxis and treatment.

Early syphilis mimicking tuberculous meningoencephalitis in an HIV-positive patient.

A man previously treated for tuberculous arthritis presented with acute meningoencephalitis. Cerebrospinal fluid tests suggested infection with Mycobacterium tuberculosis, but a diagnosis of early neurosyphilis was subsequently made.